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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"The `PyOS_*` hooks interact poorly with subinterpreters","articleBody":"`PyOS_InputHook` and `PyOS_ReadlineFunctionPointer` are globally-registered `input` hooks that have no way of recovering module-level state for the extensions that registered them. In practice, extensions like `readline` and `tkinter` get around this by using global state, which obviously isn't subinterpreter-friendly.\r\n\r\nWhat's more, extensions without advertised subinterpreter support (like `readline` and `tkinter`) who register these hooks might find themselves called from within a subinterpreter (where their extension hasn't even been loaded). That's definitely a situation we want to avoid.\r\n\r\nIt seems like the best solution for 3.12 is to only call these hooks from the main interpreter, which makes the bad situation quite a bit better. If libraries really need better APIs that work per-interpreter and have ways to access module state, we can certainly add them later (but for now maybe we'll just cross our fingers and hope that nobody actually cares).\r\n\r\n@ericsnowcurrently, how does this sound to you?\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-104674\n* gh-104760\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/brandtbucher","@type":"Person","name":"brandtbucher"},"datePublished":"2023-05-19T18:23:02.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/104668/cpython/issues/104668"}